Health calculators
Weight, nutrition, pregnancy and clinical calculators that give you an orientation figure — before an appointment, or to follow a trend over weeks. They describe populations, not individuals, so treat every result as a starting point for a conversation with a professional, never as a diagnosis.
Alcohol units calculatorWork out the alcohol units and grams in a drink from its volume and strength.Am I Overweight? CalculatorFind out if you're overweight from your BMI, with your healthy weight range and kg to reach it.Am I Underweight? CalculatorFind out if you're underweight from your BMI, with your healthy weight range and kg to reach it.Biological Age CalculatorEstimate your biological age from lifestyle factors — fitness, diet, sleep, stress and more. Educational, not medical.BMI calculatorCompute your Body Mass Index and weight category.Body fat calculatorEstimate your body fat percentage (U.S. Navy method).
Alcohol Calorie CalculatorAdd up the calories of a drinking session from a library of beers, wines, spirits and cocktails, with a custom-drink option.Breastfeeding Calorie CalculatorExtra daily calories while breastfeeding — about +500 kcal exclusive, with a gradual weight-loss option.Calorie deficit calculatorFind the daily calorie deficit to reach a weight-loss goal by a target date.Calories per meal calculatorSplit your daily calorie target evenly across your meals.Carb-to-Insulin Ratio CalculatorEstimate a starting carb ratio from your total daily dose using the 400/450/500/550 rule, with an optional mealtime bolus.Carbohydrate CalculatorEstimate your daily carbohydrate target from BMR, TDEE and your chosen carb approach.
Baby Growth Percentile CalculatorWeight, length and head circumference percentiles from the WHO Child Growth Standards, 0-24 months.Baby Milk Intake CalculatorBottle volumes per feed and per day by your baby's weight and age, with the feeding interval.Conception date calculatorEstimate the likely conception date from a due date.Due date calculatorEstimate your baby's due date (Naegele's rule).Gestational Age CalculatorGestational age in weeks and days from your LMP, due date or conception date, with trimester and EDD.hCG Doubling Time CalculatorCompute the doubling time and percentage rise between two hCG results, read against the expected range for the level reached.
Blood alcohol calculatorEstimate your blood alcohol concentration (BAC) with the Widmark formula.Blood Donation Time CalculatorFind your next eligible donation date by donation type, using either the American Red Cross or the French EFS intervals.Blood Pressure Category CalculatorClassify a reading with the ACC/AHA 2017 or the European ESC/ESH scale, plotted on a chart, with mean arterial pressure and pulse pressure.Blood Sugar Converter (mg/dL ↔ mmol/L)Convert blood glucose between mg/dL and mmol/L in both directions, and see where the value falls against the ADA reference bands.Blood Type CalculatorPredict a child's possible ABO and Rh blood types, with probabilities, from both parents' blood groups.BMR calculatorEstimate your Basal Metabolic Rate (Mifflin-St Jeor).
Caffeine intake calculatorEstimate a safe daily caffeine limit for a healthy adult.Coffee vs. Sleep CalculatorA transparent heuristic that scores a coffee against a nap for the alertness you need right now.Nap CalculatorBest nap wake-up times (or lie-down times) across common nap lengths, adding the time to fall asleep.Sleep cycle calculatorFind the best bedtimes to wake up refreshed, based on 90-minute sleep cycles.